Discovering C language (Palindrome)

#include <stdio.h>
#include <stdlib.h>

int main()
{
    char ch[50];
    char ch1[50];
    int test,i;
    printf ("Donner votre mot: ");
    scanf ("%s",ch);
    do
    {
        test=ch[i]==ch[(strlen(ch)-1)-i];
        i++;
    }while (test==1 && i<strlen(ch));
    if (test==1)
    {
        printf ("\nLe mot est palindrome");
    }
    return 0;
}